| Appose | u&:v _ _ _ | 
| &: is equivalent to & except that 
the ranks of the resulting function are infinite; the relation 
is similar to that between @: and @ . | 
   a=: 'abcd' ; 'efgh'
   b=: 'ABCD' ; 'EFGH'
                
   a
+----+----+
|abcd|efgh|
+----+----+
   b
+----+----+
|ABCD|EFGH|
+----+----+
   a ,&:> b
abcd
efgh
ABCD
EFGH
   a ,&> b
abcdABCD
efghEFGH
   > b. 0
0 0 0
   , & > b. 0
0 0 0
   , &: > b. 0
_ _ _